1. He mea hanga ki te pepa piauau kua oti te hiri, he kaha, he roa;
2. Ko te whakarewa pepa kua oti i te tukanga rehu paura electrostatic, he ataahua, he ngawari ki te horoi;
3. Ko te hoahoa taimaha te whakapai ake i te pumau;
4. Mana PLC, mahi pono me te pumau;